Negative Uniaxial Crystal:
Solution
It seems like you didn't provide a specific question about Negative Uniaxial Crystals. These crystals are a type of birefringent or double refractive crystal in which one refractive index is higher than the other two (which are equal). This means that light entering the crystal is split into two rays: an ordinary ray (O-ray) and an extraordinary ray (E-ray). The O-ray follows Snell's law, while the E-ray does not, leading to interesting optical effects.
If you have a specific question about these crystals, such as their properties, uses, or how they interact with light, feel free to ask!
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